package com.lqq.springcloud.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

@Component
public class MyLB implements LoadBalancer{

    private AtomicInteger atomicInteger = new AtomicInteger(0);

    public final int getAndIncrement() {

        int current ;
        int next;

        do {
            current = this.atomicInteger.get();
            next = current >= 2147483647 ? 0 : current+1;
        }while (!this.atomicInteger.compareAndSet(current, next));

        System.out.println("第"+ next + "次访问");
        return next;
    }


    @Override
    public ServiceInstance instances(List<ServiceInstance> serviceInstances) {
        int index = getAndIncrement()%serviceInstances.size();
        return serviceInstances.get(index);

    }


}
